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Support Ruler to query Query Frontend
Signed-off-by: SungJin1212 <tjdwls1201@gmail.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,105 @@ | ||
| package ruler | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "net/http" | ||
| "net/textproto" | ||
| "net/url" | ||
| "strconv" | ||
| "time" | ||
|
|
||
| "github.com/go-kit/log/level" | ||
| "github.com/prometheus/common/version" | ||
| "github.com/prometheus/prometheus/promql" | ||
| "github.com/weaveworks/common/httpgrpc" | ||
| "github.com/weaveworks/common/user" | ||
|
|
||
| "github.com/cortexproject/cortex/pkg/util/spanlogger" | ||
| ) | ||
|
|
||
| const ( | ||
| orgIDHeader = "X-Scope-OrgID" | ||
| instantQueryPath = "/api/v1/query" | ||
| mimeTypeForm = "application/x-www-form-urlencoded" | ||
| contentTypeJSON = "application/json" | ||
| ) | ||
|
|
||
| type FrontendClient struct { | ||
| client httpgrpc.HTTPClient | ||
| timeout time.Duration | ||
| prometheusHTTPPrefix string | ||
| jsonDecoder JsonDecoder | ||
| } | ||
|
|
||
| func NewFrontendClient(client httpgrpc.HTTPClient, timeout time.Duration, prometheusHTTPPrefix string) *FrontendClient { | ||
| return &FrontendClient{ | ||
| client: client, | ||
| timeout: timeout, | ||
| prometheusHTTPPrefix: prometheusHTTPPrefix, | ||
| jsonDecoder: JsonDecoder{}, | ||
| } | ||
| } | ||
|
|
||
| func (p *FrontendClient) makeRequest(ctx context.Context, qs string, ts time.Time) (*httpgrpc.HTTPRequest, error) { | ||
| args := make(url.Values) | ||
| args.Set("query", qs) | ||
| if !ts.IsZero() { | ||
| args.Set("time", ts.Format(time.RFC3339Nano)) | ||
| } | ||
| body := []byte(args.Encode()) | ||
|
|
||
| //lint:ignore faillint wrapper around upstream method | ||
| orgID, err := user.ExtractOrgID(ctx) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| req := &httpgrpc.HTTPRequest{ | ||
| Method: http.MethodPost, | ||
| Url: p.prometheusHTTPPrefix + instantQueryPath, | ||
| Body: body, | ||
| Headers: []*httpgrpc.Header{ | ||
| {Key: textproto.CanonicalMIMEHeaderKey("User-Agent"), Values: []string{fmt.Sprintf("Cortex/%s", version.Version)}}, | ||
| {Key: textproto.CanonicalMIMEHeaderKey("Content-Type"), Values: []string{mimeTypeForm}}, | ||
| {Key: textproto.CanonicalMIMEHeaderKey("Content-Length"), Values: []string{strconv.Itoa(len(body))}}, | ||
| {Key: textproto.CanonicalMIMEHeaderKey("Accept"), Values: []string{contentTypeJSON}}, | ||
| {Key: textproto.CanonicalMIMEHeaderKey(orgIDHeader), Values: []string{orgID}}, | ||
| }, | ||
| } | ||
|
|
||
| return req, nil | ||
| } | ||
|
|
||
| func (p *FrontendClient) InstantQuery(ctx context.Context, qs string, t time.Time) (promql.Vector, error) { | ||
| log, ctx := spanlogger.New(ctx, "FrontendClient.InstantQuery") | ||
| defer log.Span.Finish() | ||
|
|
||
| req, err := p.makeRequest(ctx, qs, t) | ||
| if err != nil { | ||
| level.Error(log).Log("err", err, "query", qs) | ||
| return nil, err | ||
| } | ||
|
|
||
| ctx, cancel := context.WithTimeout(ctx, p.timeout) | ||
| defer cancel() | ||
|
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| resp, err := p.client.Handle(ctx, req) | ||
|
|
||
| if err != nil { | ||
| level.Error(log).Log("err", err, "query", qs) | ||
| return nil, err | ||
| } | ||
|
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| vector, warning, err := p.jsonDecoder.Decode(resp.Body) | ||
| if err != nil { | ||
| level.Error(log).Log("err", err, "query", qs) | ||
| return nil, err | ||
| } | ||
|
|
||
| if len(warning) > 0 { | ||
| level.Warn(log).Log("warnings", warning, "query", qs) | ||
| } | ||
|
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||
| return vector, nil | ||
| } |
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